Flora of North America species comparison

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Artemisia arbuscula subsp. longiloba

Artemisia arbuscula subsp. thermopola
Photo is of parent taxon

little sagebrush
Photo is of parent taxon

cut-leaf sagebrush, hot springs sagebrush, little sagebrush, warm springs low sagebrush
Leaves

broadly cuneate (4–10 × 2–5 mm, often irregularly lobed, lobes rounded, middle lobes overlapping lateral lobes).

narrowly cuneate (5–10 × 3–6 mm, lobed, lobes 1/2+ blade lengths, laterals to 1 mm wide, often acute).
Involucres

2–3 × 1.5–2.5 mm.

(1.5–)2–2.5 × 1.5–2 mm.
2n

= 18, 36.

Artemisia arbuscula subsp. longiloba

Artemisia arbuscula subsp. thermopola
Phenology Flowering early–late spring. Flowering mid–late summer.
Habitat Clay soils of alkaline basins and valleys, occasionally on outwash plains of mountains Rocky soils of igneous origin
Elevation 1500–2500 m (4900–8200 ft) 2200–2500 m (7200–8200 ft)
Distribution
from FNA
CA; CO; ID; MT; OR; UT; WY
[BONAP county map]
from FNA
ID; UT; WY
[BONAP county map]
Discussion

Subspecies longiloba is distinguished from other members of the Artemisia arbuscula complex by its early blooming time. It is the only member of subg. Tridentatae to begin flowering as snow melts in early spring, and it is ecologically distinguished from other subspecies by its occurrence at low elevations, in fine-grained clay soils.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Because of its deeply lobed leaves, subsp. thermopola can be confused with Artemisia tripartita. The habit, leaf morphology, and geographic distribution of subsp. thermopola suggest introgression between typical A. arbuscula and A. tripartita.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 19, p. 511. FNA vol. 19, p. 512.
Parent taxa Asteraceae > tribe Anthemideae > Artemisia > subg. Tridentatae > Artemisia arbuscula Asteraceae > tribe Anthemideae > Artemisia > subg. Tridentatae > Artemisia arbuscula
Sibling taxa
A. arbuscula subsp. arbuscula, A. arbuscula subsp. thermopola
A. arbuscula subsp. arbuscula, A. arbuscula subsp. longiloba
Synonyms A. spiciformis var. longiloba, A. longiloba, Seriphidium arbusculum subsp. longilobum Seriphidium arbusculum var. thermopolum
Name authority (Osterhout) L. M. Shultz: Sida 21: 1637. (2005) Beetle: Rhodora 61: 83. (1959)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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